This has always been the intent of Stack Overflow, from its very earliest days. One of the stock reasons for closing a question used to be “too specific—this question is unlikely to help anyone else” (or words to that effect), though that has been removed now (I think because it upset too many people who took its blunt message the wrong way). People have always been nudged towards adjusting questions so that they’ll be generally useful.

Discussions on questions are routinely about unrelated or not-closely-related matters, and quite apart from that Stack Overflow wants to be a Q&A platform, not a discussion platform.